電力ケーブルの水トリー劣化診断のための残留電荷法に関連する空間電荷挙動

摘要

The residual charge method is expected to be a powerful tool to detect the water tree degradation of polymer insulated power cables. In this method, DC voltage is firstly applied to electrify the degraded region. Some of the charges would be deeply trapped and stayed stably, even after the DC voltage is removed and the system is short circuited. AC voltage is subsequently applied in order to release the trapped charges. The DC component current, or the integration of it, is considered to have a correlation with the degree of degradation. This paper discusses the detail of the mechanism by which the DC component signal appears. The specimen was carefully prepared so that it contained water trees with uniform length. Space charge measurement was performed by pulsed electroacoustic method. The decay process of charges under AC voltages was interpreted into the energy depth at which the charge had been trapped, assuming that the charges were detrapped by the process of Poole-Frenkel type. It was suggested that the charges trapped between 0.8-1.2 eV can be detected as the DC component current. The shallower would be released by thermal energy at ambient temperature while the system was short circuited. The deeper would not be released by realistic AC voltages. The result showed that the transition of DC component current in the residual charge method represents the behavior of space charges having been trapped at deferent energy levels. It is believed that the results give useful information to apply the method to power cables.%電力ケーブルの水トリー劣化についてはすでに多くの研rn究者が発生メカニズムおよび防止対策を検討しており，製rn造過程における問題はほぼ解決したとされる。しかし電力rn系統においては過去に布設されたケーブルが稼動しておrnり，すでに寿命に近づいているものも多いと考えられるこrnとから，効率的な設備更新のための的確な水トリー劣化診rn断方法が望まれている。